The reason Thirdshelf doesn't support this is because giving customers points is essentially giving them credit for the amount of points in spending. Instead of getting them to spend $100 and earn that 100 points by giving them 100 points you would be missing out on those sales. Instead what we encourage is tangible discount like $10 off, this will automatically encourage the customer to spend more then they normally would. If you add a minimum spend like $10 off of $50 or more then you guarantee $40 coming vs 100 points which they would redeem in the future and did not earn through spending.

If you still want to proceed with offering points as a reward, select free service. You can then manually adjust points after a customer has redeemed this offer.